プログレッシブ和英中辞典(第4版)の解説
さんばい【三倍】
three times ((as many, as much))；triple；threefold
24の３倍はいくつですか
What is 24 multiplied by 3?
10年間で彼の収入は３倍になった
His income has tripled [trebled] in ten years.
彼は私の三倍も稼いでいる
He earns three times as much as I do.
この３倍が必要だ
We need 「three times [triple] this amount.